Beat-up, stale organisation (7)
I believe the answer is:
pulsate
'beat' is the definition.
(I know that beat can be written as pulsate)
'up stale organisation' is the wordplay.
'organisation' is an anagram indicator.
'up'+'stale'='upstale'
'upstale' is an anagram of 'PULSATE'.
(Other definitions for pulsate that I've seen before include "Produce a regular throbbing sensation" , "Throb regularly like heart" , "thrill" , "Expand and contract regularly" .)